Improvement in door-fastener



McELRUY 61. HOLLY.

Burglar Alarm. i

No. 85,321. Patented Dec. 29,1868.'

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Leners Param No. 85,321, ama December 29, 1868.

IMPROVEIENT IN DO OR-IEASTENER.

The Schedule referred' to inthes Letters Patent and making part of the same.

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To all whom 'it nul/y concern Be it known that we, JAMEs H. MoELnoY and J. H. HOLLY, of Warwick, in the county of Orange, and

State of New York, have invented a new and improved i the alarm-mechanism more clearly.

Similar letters of reference indicate corresponding parts.

The objectof this invention is to provide a means of fastening doors from the inside, and is intended as a fastening for sleeping-rooms, so that burglars may not -enter without forcing the door, and may not attempt.

to enter without alarming the occupant of the room;

It consists, first, of two short. plates of metal, hinged together by means of a strong pintle or other hinge, and so tted that the said plates, when opened to their fullest extent, will make with each other an obtuse angle, which adapts it to the best holding position at the foot of the door, as will hereinafter be more fully'set forth. It also consists, in connection with the above, of a hell-dial, and its accessory alarm-mechanism, actuated by a spring, which mechanism is set in operation by the pressure of the door on a trigger or catch, when the door is pushed inward, in the attempt to open it.

The principal merits of this fastener, are, iirst, that it. is thoroughly effective in holding the' door closed against any attempt to open it :from without; second, that in setting it the door-casing or door is not sprung, bruised, or marred, asis the case with those analogous lasteners, which are jammed iny between the door and The casing, as will be seen from the following specific description.

In the drawings, A and B are the two plates of the fastener, hinged together on the pintle C, and so fitted at the hinge as to form the angle shown when opened back upon each other to their fullest extent. Sharppointed studs a a., nearthe end of the plate A, serve-to v hold the fastener in place against the footof the door.

The front upper corner of the plate'B will be presented against the door-in the manner shown, and when so presented, will act as a prop or stay to prevent the door from being opened.

Most all doors close upon a threshold-board, E, and our invention is designed to rest, when set, with the hinge upon this threshold-board, when the latter isnot too thick to prevent the'upper front corner of the plate B from being presented to the plane of the door at the proper angle to avoid slipping.

When, however, this board is too narrow or too thick, the hinge is rested against the edge of the said board, as shown inthe drawings.

It will be seen that this fastener is adapted to most doors, whether with a wide, nan-ow, thick, or thin threshold-board, or without any. The angle which the plates make with each other, -when opened to their fullest extent, is about one hundred and twenty degrees, as shown in the drawings, so as to present the plate Bin door D.

The plate B, when intended to contain'the alarmmechanism, is formed with a box-cavity, the said plate being preferably cast in that form, and the plate A then serves as a lidto close the cavity, the whole operating as a box.

The alarm-mechanism shown, is simple and ei'ective, consisting of a spring-barrel containing a spring, and provided with a toothed rini, which engages with pinion on the shaft of the escape-wheel h.

The pallet-plate b is aiiixed to a stem, c, terminating with a clapper, d. `lVhen the escape-wheel revolves, its teeth act alternately upon the pallet-ends of theplate b, and vibrate it, which causes the clapper to strike rapidly upon the bell-dial G, affixed Withinthe box in any suitable manner.

, The spring is wound with a key set on its arbor in the usual manner. l

The alarm-mechanism is set for operation by a catch, Y (1, sliding in proper guides.

It is provided with an extension, f, which projects out from the box in the manner shown, when the catch g is' brought between the teeth'of the escape-wheel h, in the manner shown.

Now, when the door is being pressed upon, it bears-V against the extension f, the catch y is pushed backward clearof the teeth ofthe wheel 71, and' the wheel is permitted to revolve, which sounds the alarm, as before described,

In setting the fastener to the door, the part f of the catchv must not quite touch the door,` lest it should be moved back, when the studs a c are pressed down into the floor. A'slight pressure of the foot upon `the plate A, is suiiicient to set the studs into the floor, thus setting the fastener iirlnly in place. I

When the alarm-mechanism is 4not desired, it can be left out and the cavity used for a match-box or tobaccobox.

Having thus described our invention, What we claim as new, and desire to secure by Letters Patent, is

rlhe combination of the door-fastener A B a and the alarm-mechanism, constructed substantially as shown and described, for the purpose specified.Av

The above speciiication of our invention -signed by us,this 10th'day of 1868.

J. H. MGELROY. JAS. H. -HOLLY. Witnessesz FRANK BLOGKLEY, E. G. CoLLnvs.

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